The mode is 1 because it is the most frequent value. It shows up four times compared to the other values (5,6) which only show up once and the value 4 only shows up twice.
The range is 5 because we subtract the max and min values to get 5. In other words, Range = Max - Min Range = 6 - 1 Range = 5
You would only have to focus on the green line and then you just have to divide it by 12 and you get 4 and than you multiply 3 cm by 4 and the answer for the actual length of the green line will be 12 cm.